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A Case-Crossover Analysis on the Association of Daily Maximum Temperature with Daily Hospital Emergency Room Visits for Cardiovascular and Cerebrovascular Diseases

Author Information

Peking University, Beijing, China.

Abstracts published in Epidemiology have been reviewed by the organizations of Epidemiology. Affliate Societies at whose meetings the abstracts have been accepted for presentation. These abstracts have not undergone review by the Editorial Board of Epidemiology.

Background and Objective:

In recent years due to global warming and heatwaves, there is more and more concern by both governments and researchers of most countries, including China, on the potential heath consequences. This study explores the association between the daily maximum temperature and hospital emergency room visits for cardiovascular and cerebrovascular disease (ICD-10: I00∼I99) in different seasons in Beijing, China.

Method:

The data of the daily hospital emergency room visits for cardiovascular and cerebrovascular disease (ICD-10: I00∼I99) from one of Peking University Hospitals in Haidian District of Beijing, China during 2004-2008, and the corresponding meteorological and air pollution data were collected. The seasonal-stratified case-crossover design, and Logistic multiple regression model was used for the data analysis.

Results:

After adjusting the influence of relative humidity, wind speed, and atmospheric pressure, it was found that for each 1°C increase in daily maximum temperature, corresponding increases in the hospital emergency room visits for the diseases were 17.3% (OR = 1.173, 95%CI:1.149-1.197) and 4.2% (OR = 1.042, 95% CI: 1.011-1.074) in spring and summer of the years, respectively (P < 0.05); contrarily, there was decrease by 25% in the autumn (OR = 0.75, 95% CI: 0.727-0.773). There was no statistically significant association between both in the winter seasons (P ≤ 0.05).

Conclusion:

The increase of daily maximum temperature may be a risk factor of daily hospital emergency room visits for cardiovascular and cerebrovascular diseases in spring and summer. However, it maybe a preventive factor in autumn. It suggests that the impacts of daily maximum temperature may be a two-edged sword on human health.

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